Door-lock for elevator-shafts.



PATENTED APR. 2l, 1,903. J. E'. BOYGE & L. SHDNNARD.

DOOR LOCK FUR ELEVATOR SHAPTS.

APPLIqgTIoN FILED H1B. z, 190s.

N0 IODBL.

UNITED STATES PATENT rricn.

JOHN n. Boron, OF NEW YORK, AND LUDLOW SHONNARD, OF YONKERS,

- NEWYORK- i DOOR-LOOK. FOR IELEvAToR-s HAFTS.

SPECIFICATIONforming part of Letters Patent No. 726,018, dated April 21,1903. Application iled February Z, 1903. Serial No. 141.486.A (Nomodel.)

To a/ZZ whom it may concern:

Be it known that we, JOHN E. BOYCE, of the borough of Manhattan, in thecitv of New York, and LUDLovv SHONNARD, of Yonkers, in the county ofWestchester, State of New York, have invented certain new and usefulImprovements in Door- Locks for Elevator- Shafts, of which the followingis a specification. I

Our invention relates to improvements in locks to prevent the opening ofthe door lof an elevator-shaft when the elevator-car is not in posit-ionvat such door.

The subject of ourinvention isa door-lock provided with a moving catchor keeper in the dOor-jamb, which when the door-latch is retractedfollows up the movement ofthe said latch so as to prevent it disengagingfrom the catch or keeper unless such movement ot' the catch be preventedby a stop applied by the car when resting in position opposite the door.

The invention further relates to an improvement by which the unlockingof the latch is prevented if an attempt be made to hold it back whilethe car is passing the station without stopping.

In the accompanyingdrawings, Figure 1 is a front view of the lock andengaging catch as viewed from the outside. view of the same. of adetail, showing the locking device which prevents theunlockingofthe'door-latch While the elevator-car is in motion'andpassingthe station. "FigL 4 is a detail'sectional view ofv an electriccontact device vused in connection of the car While the door is open. v

D may represent apart vof the sliding door of the elevator-shaft, and .Ia portion of the jamb in which the keeper or engaging catch of with ourinvention to prevent the movement' the door-latch is mounted. Thedoor-latchy 5 is pivoted on'apin 6 and is provided with a rigidarm 7,projecting approximately at' right angles from the horizontal latch-arm5 in position to be retracted in customary manner by the fingers ofthe'operator inserted in a suitable aperture 8 in the lock-casing. Aspring 9, of any suitable form, serves to press the latch 5 intoengaging position. The extremity of the latch 5 is formed, as shown,

Fig. 2 is a planI Fig. 3 is a sectional View with a hook' to engage withthe hookformed keeper or catch 10, mounted in the door-jamb. Inourinvention the hook-formed catch or keeper 10 is pivotally mounted ona 55 pin 11, which is itself pivoted in the casing 12, s'o as to turnwith the keeper 10. Said catch orkeeper l0 is pressed toward thedoorlatch 5 by a spring 13, which may be of any suitable form, so thatwhen not prevented by 6o extraneousineans the retraction Of the latch 5will cause the hook-catch l0 to follow up the movement of 'tne latch, soas to prevent -the latter disengaging therefrom.

an arm 14, which when the pin 11 is locked to the catch 10, ashereinafter described, serves to control the movement of said catch. n

15 represents atappet carried or controlled by the car and, when the caris in position 7o opposite the shaft-door, projecting in front of thearm 14, so as to prevent the movement thereof, and consequently hold thepivoted catch 10 in its retracted position, thus permitting theretraction of the latch 5 from en- 75 gagement with the catch or keeper10 and the opening of the door.

In the operation'of the invention as thus far described it will beunderstood that if an attempt be made to withdraw the latch 5 from 8oits keeper IO when the elevator-car is not in position at the'door theoscillating catch 10, following the movement of the latch 5, Willprevent the Vlatch from unlocking, and hence it is impossible to openthe door When the car 85 is not inposition. i When, however, the car isin position at the door, the tappet 15, preventing the movement of thecatch-arm 14, 'holds the hooked Vcatch 10 in retracted position, so thatthe latch 5 may be retracted 9o therefrom and the door opened.

With the invention as thus far described it might be possible for aparty reaching the 'latolva'rm 7 from the outside and holding the latchin retracted position while the car is in 95 Vmotion and approaching thestation'tocause the tappet 15 by coming in contact with the catch-arm 14to Withdraw thev` hookedcatch 10 from the latch 5 while the latter is inretracted position and while the car is in moroo tion. To prevent suchunlocking of the door while the car is in motion, the following deviceis provided: Instead of having the pivotpin 11, which is carried by thearm 14, permanently fixed to the oscillating catch 10 the said pin islocked to the catch by a radial pin 16, carried by the hub of the catch10, and pressed inward by a spring 17, so as to engage with a notch 18in the pin 11, and when the catch 10 turns on its axis retracted fromsuch engagement with the pivot-pin 11 by a camshaped lug 19, projectingfrom the inner wall of the casing 12 in position to be engaged by atransverse pin or lug 20 near the extremity of the spring-pin 16, sothat the movement of the oscillating catch 10, permitted by theretraction of the latch 5 and caused by the spring 13, will retract thespring-pin 16 from the pivot-pin 11, and thus disconnect the pin 11 andtappet-arm 14 from the oscillating catch 10. Such angular movement ofthe oscillating catch 10, following the retraction of the latch 5,having carried the spring-pin 16 ont of register with the notch 18 inthe pivotpin 11, it will be apparent that the deflection of the arm 14by the tappet l5 as the car passes the station will have no eect inretracting the oscillating catch 10 from the latch 5, and hence the doorcannot be unlocked by movement of the car past the station while thelatch 5 is held in retracted position. If the latch 5 be so held inretracted position when the car reaches the station and stops there,though the pivot-pin 11 has been turned back to normal position by thecontact of the tappet 15 with the arm 14, the catch 10 is still held inengagement with the retracted latch by the action of the spring 13 andthe spring-pin 16 is held by the fixed cam 19 out of engagement with thepivot-pin 11 until the latch 5 is released by the hand. Then thelatch-spring 9 throwing both the latch 5 and the oscillating catch 10into normal position, the spring-pin 16 will rengage with the pivot-pin11, and, the car being at rest at the station, the latch 5 can then beretracted from the catch 10, so as to permit the opening of the door.

It will be apparent that the obstruction 15, which is controlled by themovement of the car, so as to be interposed in front of the arm 14 whenthe car is in position at the door, may be a simple tappet carried bythe car itself or a device mounted in the door-jamb and projected toposition in front of the arm 14 bythe movement of the car. Tappets andobstructing devices carried or controlled by elevator-cars, so as togovern the operation of the door and prevent the opening thereof whenthe car is not in position, being well known and in common use, aspecific description of the connection of the obstructing device 15 withthe car is unnecessary.

In order to show the applicability of our device to self-controllingelectric elevators, in which the circuit is broken automatically by theopening of the shaft-door and is complete only when the doorv is closed,we have illustrated a circuit-closing device of common form, consistingof a pair of insulated contact-plates 21 22 on the opposite sides of thecatch or keeper 10, connected respectively to the contact-wires 23 24,and a pair of insulated plates 25 26 on the opposite faces of thelatch-hook 5, which are electrically connected by pin 27, insulated tothe latch, so that when the door is closed and the latch 5 is in normalposition in eective engagement with the oscillating catch or keeper 10the operating-circuit will be closed between the contact-plates 21 22.

Having thus described our invention, the following is what we claim asnew therein and desire to secure by Letters Patent:

1. In a lock for elevator-shaft doors, the combination of a spring-latch5, an oscillating catch 10 with which said latch engages adapted tofollow the movement of the latch 5 when the latter is retracted, andmeans operated by the elevatorcar to prevent such movement'of theoscillating catch when the car is in position at the door to be opened.

2. The combination of the spring-latch 5, the oscillating spring catch10 normally pressed into engagement with said latch 5 during themovement of the latter, an arm 14 adapted to hold the spring-catch 10 inretracted position, and the obstruction 15 controlled by theelevator-car interposed in the path of the arm 14 so as to arrest themovement of the spring-catch 10 when the car is in position at the door.

3. The combination of the spring-latch 5, the oscillating spring-catch10 engaging therewith, and adapted to follow the movement of the latch 5when retracted, an arm 14 connected by a pivot-pin 11 and locking-pin 16to the catch 10 so as to control the movement of the said catch, theobstruction 15 controlled by the car to arrest the movement of the arm14 when the car is in position, and means for retracting the locking-pin16 from IOC the pivot-pin 11 and thus disconnecting the arm 14 from thecatch l0 when the absence of the obstruction 15 permits the movement ofthe oscillating catch 10.

4. The combination of the spring-latch 5, the oscillating spring-catch10, rotating pivot 11, arm 14 mounted on the pivot-pin 11, springpin 16locking the arm 14 to the oscillating catch 10, and a fixed lug 19retracting the locking-pin 16 from the pivot-pin 1l by the angularmovement of the catch l0, substantially .as and for the purposesdcscribed.

JOHN E. BOYCE. LUDLOW SHONNARD. Witnesses:

OcTAvIUs KNIGHT, J. GREEN.

